JP2004330023A - Fluid filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid filter having low pressure loss and high dust capturing ratio. <P>SOLUTION: In the fluid filter 1, areas 12, 32, 52, 60 having an average bore diameter and areas 11, 20, 31, 40, 51 having a large average bore diameter are alternately arranged in a circulation direction of the fluid and/or a direction of crossing the circulation direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００５６】
比較例１の流体フィルタは、全体が上記細目領域のセラミック多孔体であり、比較例２の流体フィルタは全体が上記細目領域よりも更に平均孔径の小さいセラミック多孔体（１インチ（２５ｍｍ）当たりのセル数が４０個のセル膜のない３次元網状骨格構造の軟質ポリウレタンフォームを前駆体として製造されたもの）である。比較例１，２のいずれのセラミック多孔体についても一辺の長さが１００ｍｍ×１００ｍｍで表１に示す厚さのものについて各々測定を行った。
【００５７】
各流体フィルタに５０００Ｌ／ｍｉｎの流量で含塵空気を流通させて圧力損失及び粉塵捕集率を調べた。含塵空気としては、ＪＩＳ−１２種の粉塵（カーボンブラック）を０．２ｇ／ｍ^３含むものを用いた。結果を次の表１に示す。
【００５８】
【表１】

【００５９】
表１より明らかなように、実施例１の本発明の流体フィルタは、比較例のうち、最も粉塵捕集率の高い比較例２の２０ｍｍ厚みのものよりも更に捕集率は高く、また、圧力損失についてはその１／２程度に低減されている。
【００６０】
【発明の効果】
以上の通り、本発明によると、圧力損失が低くしかも粉塵捕集率が高い流体フィルタが提供される。
【図面の簡単な説明】
【図１】実施の形態に係る流体フィルタ１を示すものであり、（ａ）図は流体フィルタの平面図、（ｂ）図は正面図、（ｃ）図は（ａ）図のＣ−Ｃ線断面図、（ｄ）図は（ｃ）図のＤ−Ｄ線断面図である。
【図２】別の実施の形態に係る流体フィルタを示す図であり、（ａ）図は平面図、（ｂ）図は正面図である。
【図３】図３（ａ）は図２（ａ）のＡ−Ａ線に沿う断面図、図３（ｂ）は図３（ａ）のＢ−Ｂ線に沿う断面図である。
【図４】図１の流体フィルタを製造するための軟質ポリウレタンフォームピースの組み立て構造図である。
【符号の説明】
１，７０ 流体フィルタ
２ 枠部
１０ 第１層
１１，３１，５１，７２ａ，７４ａ，７６ａ，７８ａ 粗目領域
１２，３２，５２，７２ｂ，７４ｂ，７６ｂ，７８ｂ 細目領域
２０ 第２層
３０ 第３層
３０ 第３層
４０ 第４層
５０ 第５層
６０ 第６層[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluid filter made of a porous ceramic body for filtering a fluid such as air to remove dust.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a synthetic resin foam having a three-dimensional network skeleton structure having an internal communication space, for example, a soft polyurethane foam without a cell membrane is immersed in a ceramic slurry, the ceramic is adhered to a skeleton of the polyurethane foam, and dried and fired. A ceramic porous body having a three-dimensional network skeleton obtained as described above is known (for example, JP-A-11-285578, JP-A-2000-109376).
[0003]
Since the ceramic porous body has characteristics such as low bulk specific gravity, high heat resistance, inertness, and low airflow resistance, that is, low pressure loss, a grease filter for a kitchen, a catalyst carrier, a gas-permeable heat insulating material, a molten metal, Although it is used as a filter material, it is required that the pressure loss be as low as possible when used for these applications.
[0004]
Conventionally, to reduce the pressure loss, the degree of adhesion of the ceramic slurry to the polyurethane foam was reduced to almost eliminate clogging.However, the apparent specific gravity of the porous ceramic body was reduced, and there was a problem in strength. there were.
[0005]
In addition, a method of adding various organic surfactants, peptizers, and the like to the ceramic slurry to adjust the slurry properties has been adopted. According to this method, the skeleton becomes thicker and the strength becomes larger. However, there is a problem that clogging occurs to some extent and the pressure loss is not sufficiently reduced. In addition, since there is a large amount of combustible-dissipating organic components in addition to the ceramic raw material soil, the obtained ceramic porous body has many pores and has a porous structure. For this reason, for example, when used as a filter for dust-containing gas, dust enters the skeleton of the porous ceramic body, and the pressure loss increases with time. Further, the porous skeleton may cause a problem in strength.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fluid filter made of a porous ceramic body having excellent dust removal performance and low pressure loss.
[0007]
[Means for Solving the Problems]
The fluid filter of the present invention is a fluid filter made of a porous ceramic body in which a fluid flows from one surface to the other surface, and has a small average pore diameter in a flow direction of the fluid and / or in a direction crossing the flow direction. The region and the region having a large average pore diameter are alternately arranged.
[0008]
In the fluid filter of the present invention, the regions having a small average pore size and the regions having a large average pore size are alternately arranged, so that the fluid flowing into the fluid filter passes from the filter inflow surface to the outflow surface when passing through the inside of the filter. It cannot pass straight, and the filtration length becomes longer, and the effect of collecting dust and the like is improved. When the direction of flow of the dust-containing fluid is changed in a region having a small average pore diameter, dust and the like having a higher specific gravity than the fluid are collected in the region having a small average pore size due to centrifugal force, inertia, and the like. In this way, dust is separated and collected from the dust-containing fluid using centrifugal force and inertia, so that the dust-containing fluid can selectively pass through a region with a large average pore diameter and reduce pressure loss. Become.
[0009]
In the fluid filter of the present invention, it is preferable to arrange a region having a small average pore size on the outflow surface side of the fluid, whereby the above-described centrifugal force, dust that could not be collected by the collection performance due to inertia or the like is removed. It becomes possible to collect in a region having a small average pore diameter on the outflow surface side.
[0010]
Specifically, the fluid filter of the present invention can have the following configuration.
{Circle around (1)} The plate has a flat shape, and the flow direction of the fluid is the thickness direction of the flat fluid filter. In the thickness direction and a direction perpendicular to the thickness direction, regions having a small average pore size and regions having a large average pore size are alternately arranged. Is a fluid filter.
{Circle around (2)} The flow direction of the fluid is a radial direction, and a region having a large average pore diameter and a region having a small average pore diameter are in a direction parallel to the cylinder axis of the cylindrical fluid filter and in the radial direction. Fluid filters alternately arranged.
[0011]
The porous ceramic body of the present invention is obtained by immersing a synthetic resin foam having a three-dimensional network skeleton structure having an internal communication space in a ceramic slurry to allow the ceramic to adhere to the synthetic resin foam, followed by drying and firing. It is preferably a ceramic porous body having a three-dimensional network skeleton structure.
[0012]
INDUSTRIAL APPLICABILITY The fluid filter of the present invention is suitable for removing dust such as air.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the fluid filter of the present invention will be described in detail.
[0014]
As described above, the porous ceramic body of the present invention is preferably formed using a synthetic resin foam having a three-dimensional network skeleton structure having an internal communication space as a base material.
[0015]
As such a synthetic resin foam, any one having a three-dimensional network skeleton structure having an internal communication space can be used, but a flexible polyurethane foam, particularly a flexible polyurethane foam having no cell membrane can be suitably used. As the polyurethane foam without the cell membrane, those in which the cell membrane is eliminated by control during foaming, or those in which the cell membrane is removed by alkali treatment, heat treatment, water pressure treatment, or the like can be used, and the number of cells, porosity, etc. Physical properties can be selected according to the application.
[0016]
The ceramic porous body is obtained by immersing the above-described synthetic resin foam in a ceramic slurry, attaching the ceramic slurry to the synthetic resin foam, drying and firing, and thermally decomposing or burning the synthetic resin foam. .
[0017]
Examples of the ceramic include oxide ceramics such as alumina, silica and cordierite, non-oxide ceramics such as silicon carbide and silicon nitride, and sialon.
[0018]
In addition, clay can be blended in order to increase the stability of the ceramic slurry. As this clay, for example, Kibushi clay, Frog-eye clay and the like can be used. Further, the blending amount is preferably 0 to 15% with respect to all the ceramic components. If the content is more than 15%, the thixotropic index changes and causes clogging.
[0019]
In addition, a thixotropic property can be adjusted by blending a binder such as polyvinyl alcohol and carboxymethylcellulose as needed with the ceramic slurry.
[0020]
The viscosity of the ceramic slurry can be adjusted by adjusting the amount of water to be added according to the size of the target cell of the ceramic porous body.
[0021]
Next, a synthetic resin foam having a three-dimensional network skeleton structure is immersed in the above-described ceramic slurry to remove excess slurry, dried, and fired at a temperature of about 1000 to 1500 ° C. in a firing furnace to obtain a synthetic resin foam. A ceramic porous body having a three-dimensional network skeleton structure having an internal communication space having a cell structure corresponding to the body can be obtained.
[0022]
In the fluid filter of the present invention, regions having a small average pore size and regions having a large average pore size are alternately arranged in the flow direction of the fluid and / or the direction crossing the flow direction.
[0023]
In order to alternately arrange regions having different average pore diameters in this manner, synthetic resin foam cylindrical bodies having a three-dimensional network skeleton structure having different average pore diameters, that is, different coarsenesses, are combined in a predetermined arrangement. Then, an integrated precursor is manufactured, and this precursor is immersed in a ceramic slurry to remove excess slurry, dried, and fired in a firing furnace.
[0024]
In the fluid filter of the present invention, there is no particular limitation on the average pore diameter of the region having a small average pore diameter and the average pore diameter of the region having a large average pore diameter. It is appropriately determined according to the arrangement of the region having the large average pore diameter, the size of the region, and the like, but the region having the small average pore diameter has an average pore diameter of about 0.1 to 1.5 mm in order to secure trapping performance. On the other hand, in a region having a large average pore diameter, the average pore diameter is preferably about 1.0 to 5.0 mm in order to reduce pressure loss. In particular, the region having a small average pore size and the region having a large average pore size are different in the average pore size, and the effect of the present invention by alternately arranging the region having a small average pore size and the region having a large average pore size is larger in the difference. It can be obtained sufficiently and is preferable. Therefore, it is preferable that the average pore diameter in the region having the large average pore diameter is 1.2 times or more the average pore diameter in the region having the small average pore diameter. In terms of the design of the fluid filter, it is particularly preferable that the average pore size in the region having a large average pore size is 2 to 4 times the average pore size in the region having a small average pore size.
[0025]
In the fluid filter of the present invention, the two types of regions having different average pore diameters, that is, a region having a small average pore size and a region having a large average pore size, are not limited to those alternately arranged. Three or more types of regions, that is, a region having a large pore diameter and a region having an average pore diameter in the middle of these regions may be arranged in combination.
[0026]
In the fluid filter of the present invention, when regions having a small average pore size and regions having a large average pore size are alternately arranged in the flow direction of the fluid and / or the direction crossing the flow direction, the flow of the fluid in the fluid filter is Area ratio of a region having a small average pore diameter in a cross section along the direction (percentage of a ratio obtained by dividing the total area occupied by the region having a small average pore diameter in the cross section by the total area of the cross section. Is preferably 20 to 80%, particularly about 30 to 60% in only the filtration part except the frame part. If this ratio is less than 20%, the trapping performance is insufficient, and if it exceeds 80%, the pressure loss increases, which is not preferable.
[0027]
In the fluid filter of the present invention, when regions having a small average pore size and regions having a large average pore size are alternately arranged in the direction crossing the fluid flow direction, the cross section along the direction crossing the fluid flow direction of the fluid filter. Is also preferably about 20 to 80%, especially about 40 to 60% only in the filtration part except the frame part. If this ratio is less than 20%, the trapping performance is insufficient, and if it exceeds 80%, the pressure loss increases, which is not preferable.
[0028]
Hereinafter, a specific configuration of the fluid filter of the present invention will be described with reference to the drawings.
[0029]
1A and 1B show a fluid filter 1 according to an embodiment, in which FIG. 1A is a plan view of the fluid filter, FIG. 1B is a front view, and FIG. 1C is a line CC in FIG. FIG. 3D is a cross-sectional view taken along line DD of FIG. 2 and 3 are views showing a fluid filter according to another embodiment. FIG. 2 (a) is a plan view, FIG. 2 (b) is a front view, and FIG. 3 (a) is a view of FIG. 2 (a). FIG. 3B is a cross-sectional view taken along the line BB of FIG. 3A.
[0030]
The fluid filter 1 of FIG. 1 is of a rectangular flat plate shape, and has a region with a small average pore diameter (hereinafter sometimes referred to as “fine”) and a region with a large average pore diameter (hereinafter sometimes referred to as “coarse”). The area is mixed.
[0031]
The fluid filter 1 includes a thin frame portion 2, a first layer 10, a second layer 20, a third layer 30, and a fourth layer 10 formed in the frame portion 2 so as to overlap in the thickness direction of the fluid filter 1. It has a layer 40, a fifth layer 50 and a sixth layer 60. The second, fourth, and sixth layers 20, 40, and 60 are all fine as a whole. In the first, third, and fifth layers 10, 30, and 50, fine regions and coarse regions are alternately provided in one direction (the left-right direction in FIGS. 1A and 1C) perpendicular to the thickness direction. ing.
[0032]
In the first layer 10, the coarse area 11 and the fine area 12 are arranged from one side (the left side in FIG. 1C) to the other side (the right side in FIG. 1C) from the fluid filter. Are arranged alternately. In the third layer 30, the fine regions 32 and the coarse regions 31 are alternately arranged from the one side to the other side. In the fifth layer 50, as in the first layer 10, coarse areas 51 and fine areas 52 are alternately arranged from the one side to the other side. The widths of the coarse regions 11, 31, 51 and the fine regions 12, 32, 52 are substantially the same.
[0033]
Since only the third layer 30 has an arrangement of the fine region and the coarse region opposite to that of the first and fifth layers 10 and 50, the coarse layer of the third layer is located between the fine regions 12 and 52 of the first and fifth layers. An area 31 is arranged, and a third layer fine area 32 is arranged between the first and fifth coarse areas 11 and 51.
[0034]
It is preferable that the fluid filter 1 of FIG. 1 is usually a plate having a side length of about 50 to 200 mm and a thickness of about 20 to 100 mm. Further, the width of the fine regions 12, 32, 52 and the coarse regions 11, 31, 51 in the fluid inflow surface direction is preferably 5 to 30 mm, and the height of the filter in the thickness direction is about 5 to 30 mm. Is preferred. Note that the width and height of the fine region and the coarse region do not need to be uniform, and may be different between the fine region and the coarse region, or may be different sizes depending on the arrangement location.
[0035]
The thickness of the narrow region (sixth layer 60) arranged on the fluid outflow surface side of the fluid filter 1 is preferably about 1 to 30 mm.
[0036]
In FIG. 1, three layers in which fine regions and coarse regions are alternately arranged in the direction orthogonal to the thickness direction are provided in total in the thickness direction, but the number of layers is not limited thereto. Two or four or more layers may be used. Although the second and fourth layers 20 and 40 are coarse areas, they may be fine areas as long as the above-mentioned preferable fine area ratio is satisfied. It is preferable that the sixth layer 60 on the fluid outflow surface side be a fine region in terms of trapping performance. It is also preferable that the frame 2 be a fine region in order to secure the strength of the fluid filter and to prevent leakage of dust-containing gas.
[0037]
The fluid filter 1 is made of a porous ceramic manufactured by immersing a precursor made of a flexible polyurethane foam in a ceramic slurry, removing excess slurry, drying and firing as described above. By this firing, the precursor is burned off and removed. The configuration of this precursor will be described with reference to FIG.
[0038]
This precursor is formed into a square shape by fitting a bottom plate 4 for forming a sixth layer 60 to the bottom of a rectangular frame 3 for forming the frame portion 2 to form a square shape. Square rods 5 and 6 for forming 50 are laid alternately adjacently on the left and right sides, a flat plate 7 for forming the fourth layer 40 is laid thereon, and the third layer 30 is formed thereon. Square bars 6 and 5 are laid out, and a flat plate 7 for forming the second layer is laid thereon. Finally, square bars 5 and 6 for forming the first layer 10 are laid thereon. They are arranged. The frame 3, the bottom plate 4, and the square rod 5 are made of fine flexible polyurethane foam. The square rod 6 and the flat plate 7 are made of coarse flexible polyurethane foam. The square rods 5 and 6 have the same dimensions, and their lengths are the same as the inner dimensions of the frame 3. The bottom plate 4 and the flat plate 7 have the same dimensions. Since the square rod body 6 and the flat plate 7 are coarse, the fluid filter obtained by firing has coarse regions 11, 31, and 51, the second layer 20 and the fourth layer 40 are coarse, and the others are fine.
[0039]
The fluid filter 1 of FIG. 1 is disposed in a casing so as not to suck the fluid from the side surface, and by suctioning the outflow side of the fluid so that the fluid flows in a flow direction indicated by an arrow in FIG. Then, the inflowing fluid is filtered to remove dust.
[0040]
The fluid filter 70 of FIGS. 2 and 3 has a cylindrical shape, and the fluid flows in the radial direction (the direction opposite to the centripetal direction).
[0041]
The fluid filter 70 includes eight layers of a first layer 71 to an eighth layer 78 which are coaxially arranged in a stacked manner from the outer peripheral side toward the inner peripheral side. The first layer 71 is composed of only the fine region, the third, fifth and seventh layers 73, 75 and 77 are composed of only the rough surface region, and the second, fourth, sixth and eighth layers 72, 74, 76 and 78 are of the coarse region. 72a, 74a, 76a, 78a and fine regions 72b, 74b, 76b, 78b.
[0042]
Each of the coarse regions 72a, 74a, 76a, 78a and the fine regions 72b, 74b, 76b, 78b is an annular shape surrounding the fluid filter 70. The width of each of the regions 72a, 72b, 74a, 74b, 76a, 76b, 78a, 78b in the direction parallel to the axis of the fluid filter is the same.
[0043]
The second layer 72 and the sixth layer 76 include fine regions 72b, 76b and coarse regions 72a, 76a from one end surface (upper surface of FIG. 3A) to the other surface (lower surface of FIG. 3A). And are alternately arranged. In the fourth layer 74 and the eighth layer 78, coarse regions 72a and 78a and fine regions 72b and 78b are alternately arranged from the one end surface to the other end surface. Both end faces of the fluid filter 70 are fine.
[0044]
Since the arrangement of the coarse regions 72a and 76a and the fine regions 72b and 76b of the second and sixth layers and the arrangement of the coarse regions 74a and 78a and the fine regions 74b and 78b of the fourth and eighth layers are reversed. In the centripetal direction, the coarse regions 72a and 76a of the second and sixth layers overlap the fine regions 74b and 78b of the fourth and eighth layers, and the fine regions 72b and 76b of the second and sixth layers and the fourth region. The layers and the coarse regions 74a, 78a of the eighth layer overlap.
[0045]
The fluid filter 70 of FIGS. 2 and 3 is usually a cylindrical shape having an outer diameter of 120 to 300 mm, an inner diameter of 40 to 160 mm, a thickness ((outer diameter−inner diameter) / 2) of 40 to 100 mm, and a height of about 50 to 150 mm. Preferably, the unit of the numerical value of the dimension described in FIGS. 2 and 3 is mm. Regarding the height and width of the fine region and the coarse region and the thickness of the fine region on the fluid outflow surface side, FIG. It is preferable that the value is substantially equal to the value described above in the description of the fluid filter.
[0046]
In FIG. 3, a total of four layers in which the fine regions and the coarse regions are alternately arranged in the circumferential direction are provided in the radial direction, but the number of layers is not limited to this, and three or less layers are provided. Or five or more layers. Although the third, fifth, and seventh layers 73, 75, and 77 are coarse areas, they may be fine areas as long as the above-described preferable fine area ratio is satisfied. It is preferable that both end surfaces be fine regions in order to secure the strength of the fluid filter and to prevent leakage of dust-containing gas.
[0047]
This fluid filter 70 is also manufactured by dipping a precursor made of a flexible polyurethane foam in a ceramic slurry, removing excess ceramic slurry, drying and firing. This precursor is formed of a cylindrical fine polyurethane foam for forming the first layer, a cylindrical coarse polyurethane foam for forming the third, fifth, and seventh layers, and coarse regions 72a, 74a, 76a, and 78a. It is formed by combining a coarse annular polyurethane foam, a thin annular flexible polyurethane foam for forming the narrow regions 72b, 74b, 76b, 78b, and an annular plate-like thin flexible polyurethane foam for forming both end surfaces of the fluid filter. You.
[0048]
The fluid filter 70 shown in FIGS. 2 and 3 is arranged in the casing so as not to suck the fluid from both end faces, and the fluid outlet side (cylindrical shape) so that the fluid flows in the flow direction shown by the arrow in FIG. By suctioning the outer part of the fluid filter), the inflowing fluid is filtered to remove dust. In addition, the fluid filter 70 may be configured such that the inner peripheral side is sucked and the fluid flows from the outer peripheral surface to the inner peripheral surface. However, at this time, the fine region on the outer peripheral side is arranged on the inner peripheral side.
[0049]
In any of the fluid filters shown in FIGS. 1, 2 and 3, the fluid flowing into the fluid filter is efficiently removed while passing through the inside of the fluid filter in which the fine regions and the coarse regions are alternately arranged. In addition, the presence of the coarse region reduces the pressure loss, so that the dust removing process can be performed over a long period of time with a low pressure loss.
[0050]
【Example】
Next, measurement results of the dust collection rate and the pressure loss performed on the fluid filter 1 shown in FIG. 1 and the fluid filter according to the comparative example will be described.
[0051]
The ceramic porous body of the example was manufactured as follows.
[0052]
That is, 95 parts by weight of alumina by the Bayer method, 5 parts by weight of Kibushi clay, 4 parts by weight of polyvinyl alcohol, and 20 parts by weight of water were mixed to prepare a ceramic slurry.
[0053]
In addition, a flexible polyurethane foam having a three-dimensional network skeleton structure without a cell membrane for forming a fine region having 30 cells per inch (25 mm) and a coarse region having 10 cells per inch (25 mm) are formed. A flexible polyurethane foam having a three-dimensional network skeleton structure without a cell membrane was combined and fitted as shown in FIG. 2 to produce a precursor. After immersing the precursor in the slurry, the excess slurry was removed, dried sufficiently, and then fired at 1300 ° C. for 10 hours to obtain a porous ceramic body.
[0054]
The fluid filter made of the porous ceramic body has a flat plate shape with a thickness of 150 mm × 150 mm × 45 mm (the size of the outer shape including the frame portion). 1.90 mm, the dimensions of each part are as follows.
[0055]

[0056]
The fluid filter of Comparative Example 1 is entirely a porous ceramic body having the above-described fine region, and the fluid filter of Comparative Example 2 is entirely a ceramic porous body having a smaller average pore diameter than the above-described fine region (per inch (25 mm)). A flexible polyurethane foam having a three-dimensional network skeleton structure without a cell membrane having 40 cells as a precursor). With respect to each of the ceramic porous bodies of Comparative Examples 1 and 2, the measurement was performed for each of the porous bodies having a side length of 100 mm × 100 mm and the thickness shown in Table 1.
[0057]
Dust-containing air was passed through each fluid filter at a flow rate of 5000 L / min, and pressure loss and dust collection rate were examined. As the dust-containing air, air containing 0.2 g / m ^{3 of} JIS-12 type dust (carbon black) was used. The results are shown in Table 1 below.
[0058]
[Table 1]

[0059]
As is clear from Table 1, the fluid filter of the present invention of Example 1 has a higher collection rate than that of Comparative Example 2 having the highest dust collection rate of 20 mm in the comparative examples. The pressure loss is reduced to about 1/2 of that.
[0060]
【The invention's effect】
As described above, according to the present invention, a fluid filter having a low pressure loss and a high dust collection rate is provided.
[Brief description of the drawings]
1A and 1B show a fluid filter 1 according to an embodiment, in which FIG. 1A is a plan view of a fluid filter, FIG. 1B is a front view, and FIG. FIG. 4D is a sectional view taken along line DD of FIG.
FIG. 2 is a diagram showing a fluid filter according to another embodiment, wherein FIG. 2 (a) is a plan view and FIG. 2 (b) is a front view.
3A is a cross-sectional view taken along line AA of FIG. 2A, and FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A.
FIG. 4 is an assembled structural view of a flexible polyurethane foam piece for manufacturing the fluid filter of FIG. 1;
[Explanation of symbols]
1, 70 Fluid filter 2 Frame part 10 First layer 11, 31, 51, 72a, 74a, 76a, 78a Coarse area 12, 32, 52, 72b, 74b, 76b, 78b Fine area 20 Second layer 30 Third layer 30 third layer 40 fourth layer 50 fifth layer 60 sixth layer

Claims (6)

In a fluid filter composed of a ceramic porous body in which a fluid flows from one surface to the other surface,
A fluid filter, wherein regions having a small average pore size and regions having a large average pore size are alternately arranged in a flow direction of the fluid and / or a direction crossing the flow direction. 2. The fluid filter according to claim 1, wherein regions having a small average pore size and regions having a large average pore size are alternately arranged in a flow direction of the fluid and a direction crossing the flow direction. 3. The fluid filter according to claim 1, wherein a region having a small average pore diameter is arranged on the outflow surface side of the fluid. The fluid filter according to any one of claims 1 to 3, wherein the fluid filter is a flat plate, the flow direction is a thickness direction of the flat fluid filter, and an average pore diameter is small in the thickness direction and a direction orthogonal to the thickness direction. A fluid filter, wherein regions and regions having a large average pore diameter are alternately arranged. The fluid filter according to any one of claims 1 to 3, wherein the fluid filter is cylindrical, the flow direction is a radial direction, and an average in a direction parallel to a cylindrical axis of the cylindrical fluid filter and in a radial direction. A fluid filter, wherein regions having a large pore size and regions having a small average pore size are alternately arranged. The ceramic porous body according to any one of claims 1 to 5, wherein the ceramic porous body is formed by immersing a synthetic resin foam having a three-dimensional network skeleton structure having an internal communication space in a ceramic slurry to attach ceramic to the synthetic resin foam. A fluid filter characterized by being a ceramic porous body having a three-dimensional network skeleton structure obtained by drying, firing and drying.

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